>I've created a control that I can drop on my form. In my control, there is a property that have an Assign() method. If I assign a new value programatically, the Assign() method fire. But if I assign a value in the property sheet, the Assign() doesn't fire.
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>I suspect that this is normal behavior, but in that case, how do you make sure that an invalid value isn't assigned to a property?

Hi Sylvain,

Well on one hand, it's the developper who's going to put in a value there, so I tend to trust him (which usually means me in my case) to enter a valid value.

On the other hand, you could always add an extra check in the Init method of that object.